You could swim through the deepest voids and encounter a single hydrogen atom in an entire football field's worth of space.

In the Big Bang Theory, the cosmic microwave background — microwave-range radiation that floats through the entire universe ...

The earliest light in the universe has been traveling across space since just after the Big Bang. Known as the cosmic ...

New observations support the idea that hot, diffuse threads of gas called cosmic filaments connect clusters of galaxies ...

The expanding universe is one of the most fascinating and far-reaching discoveries in modern science. At its core lies a ...

The team used the Multi-Unit Spectroscopic Explorer (MUSE) on the European Southern Observatory’s Very Large Telescope in ...

For years, scientists have worked to chart the universe’s massive structure, aiming to test key models of cosmology. These ...

Webb’s new images of the Bullet Cluster reveal the most detailed dark matter map yet, shedding light on cosmic collisions and ...

A vast filament of gas stretching across the cosmos may help solve the mystery of the Universe’s missing matter. Astronomers ...

The cosmic microwave background is the oldest light in the Universe, emitted about 380,000 years after the Big Bang. It corresponds to the moment when the Universe became cool enough for electrons and ...

Seen as a long strand with smaller threads branching, the Quipu superstructure contains 68 galaxy clusters spanning 1.4 ...

For the first time, astronomers have used a ground-based telescope to observe polarized microwave light from the universe's earliest epoch. Their observations could give them a better understanding of ...